F-150_93

My recent purchase was a 93 F150, great truck and with the help of the forum already its even better. So now that the power train is up to par its time to take a look into the all the accessories. First thing I noticed is the "Power Slide" window, I know this is not factory but a great addition if it would work. Since it attached to a motor I cannot open manually. When I push the open / close button the motor just clicks and the glass does not move. I dont know where to begin with this, hopefully some can shed some light for me. Thanks for reading.